trimText.js

function getHeight(elementStyle) {
  return parseInt(elementStyle.height) + parseInt(elementStyle["margin-top"]) + parseInt(elementStyle["margin-bottom"]);
}

function trimText(element, elementHeight, maxHeight) {
  var tmpText = element.innerHTML;
  var words = tmpText.split(" ");
  
  var min = 0;
  var max = words.length;
  var mid = Math.ceil((max + min) / 2);
  
  do {
    mid = Math.ceil((max + min) / 2);
    element.innerHTML = words.slice(0, mid).join(" ");
    elementHeight = getHeight(window.getComputedStyle(element));
    if (elementHeight > maxHeight) {
      max = mid;
    } else {
      min = mid - 1;
    }
  } while((mid - min) > 1 || (max - mid) > 1) 

  if (elementHeight > maxHeight) {
    element.innerHTML = "";
    elementHeight = getHeight(window.getComputedStyle(element));
  }

  return elementHeight;
}

function trimArticles(articlesSelector) {
  var articles = document.querySelectorAll(articlesSelector);
  var article;

  for (var i = 0; i< articles.length; i++) {
    article = articles[i];
  
    var articleStyle = window.getComputedStyle(article);
    var maxHeight = parseInt(articleStyle.height) - parseInt(articleStyle["padding-top"]) - parseInt(articleStyle["padding-bottom"]);

    var element, elementStyle, elementHeight;
    for (var j = 0; j < article.children.length; j++) {
      element = article.children[j];
      elementStyle = window.getComputedStyle(element);   
      if (elementStyle["float"] != "none") {
        continue;
      }
      elementHeight = getHeight(elementStyle);
    
      if (maxHeight > 0) {
        if (elementHeight > maxHeight) {
          elementHeight = trimText(element, elementHeight, maxHeight);        
        }
      } else {
        element.innerHTML = "";
        elementHeight = getHeight(window.getComputedStyle(element));
      }
      maxHeight = maxHeight - elementHeight;
    }
  }
}